I removed the power head and all attachments to replace the gaskets under the motor because water and exhaust fumes were getting under the cowl. I thought I would start from scratch with the link and sync. I adjusted the carb plate to horizontal at full throttle and adjusted the timing to 34 BTC at cranking speed as my manual states. When I pull back to idle position the timing at cranking speed is 10 BTC as my manual states. Here is the problem - My throttle plate in the carb is still open a little like the throttle tower is not going back far enough. When I adjust the stop it changes my timing. I have also moved the contact roller to all positions and the plate will not fully close. Any help would be appreciated.